Is there such a thing? When my ds (5) gets together with his cousin (3); my husbands sisters daughter, they play well, love seeing each other but naturally as they are kids they have a few tug of wars over toys, usually my son toys, he will bring over paw patrol toys or transformers, she'll want a turn- fair enough but wants it when he has it, again usual children's behaviour.
However my sis in law is increasingly annoying me with pandering to her dd, the dd wants something and if she doesn't get it immediately bursts in to tears, so then her mum and dad get annoyed at my son for not instantly giving up his toy that he is playing with. "Oh you've not to get a turn" was today's offering! Totally blown out of proportion.